Wheelchair chassis



FIG. 1 is a perspective view of a wheelchair chassis, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a front elevational view; and,

FIG. 5 is a rear elevational view thereof.

The broken line showing is included for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for a wheelchair chassis, as shown and described. 